锥面
极限抗拉强度
断裂(地质)
结构工程
多项式回归
多项式的
正确性
线性回归
机械
材料科学
地质学
数学
岩土工程
几何学
工程类
算法
复合材料
数学分析
物理
统计
作者
Kuidong Gao,Changlong Du,Hongxiang Jiang,Songyong Liu
标识
DOI:10.3221/igf-esis.27.06
摘要
In order to predict the PCF (Peak Cutting Force) of conical pick in rock cutting process, a theoretical model is established based on elastic fracture mechanics theory. The vertical fracture model of rock cutting fragment is also established based on the maximum tensile criterion. The relation between vertical fracture angle and associated parameters (cutting parameter n and ratio B of rock compressive strength to tensile strength) is obtained by numerical analysis method and polynomial regression method, and the correctness of rock vertical fracture model is verified through experiments. Linear regression coefficient between the PCF of prediction and experiments is 0.81, and significance level less than 0.05 shows that the model for predicting the PCF is correct and reliable. A comparative analysis between the PCF obtained from this model and Evans model reveals that the result of this prediction model is more reliable and accurate. The results of this work could provide some guidance for studying the rock cutting theory of conical pick and designing the cutting mechanism.
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